<%@ taglib prefix="c" uri="http://java.sun.com/jsp/jstl/core" %>
<%--01_set.jsp--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>01_set</title>
</head>
<body>
    before set username:${ username } <br>
    <c:set scope="page" var="username" value="lisimmy"></c:set>
    <%--  等价于pageContext.setAttribute("username","lisimmy");  --%>
    after set username:${ username } <br>
</body>
</html>
